docs(planning): v1.4.34 IW-B close-out report

Captures the analytics lastSeenByType surface, the bfcache-friendly
Cache-Control directive, the dashboard tile-strip staleDays wiring,
the CoachLaunchProvider hoist, and the dashboard hero CTA — three
commits on develop with quality gates passing across 4205 tests.

.planning/round-v1434-iwb-report.md

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+# v1.4.34 IW-B — implementation report
+
+Branch: `develop`. Three commits pushed:
+
+| SHA        | Title                                                                    |
+| ---------- | ------------------------------------------------------------------------ |
+| `9a8a9e9a` | feat(analytics): expose per-type lastSeenByType + bfcache-friendly Cache-Control |
+| `721e88df` | feat(i18n): add stale-hint week/month plurals and dashboard coach CTA    |
+| `0729c202` | feat(dashboard): hoist Coach launch provider and add hero CTA            |
+
+## Scope deltas vs the brief
+
+1. **`/api/analytics` `lastSeenByType`** — additive field on both the default
+   thick path and the `?slice=summaries` slim slice. Default path captures
+   the freshest `measuredAt` per `MeasurementType` in the existing per-type
+   chunked walk (`.at(-1)` on the ascending-sorted series). Slim slice adds
+   `measured_at` to the existing `DISTINCT ON (type)` pass — zero extra
+   round-trips. Shape:
+   `lastSeenByType[type] = { lastSeenAt: string, daysAgo: number } | null`.
+2. **`<TrendCard staleDays>` wiring** — 12 mounts on `src/app/page.tsx`
+   pass `staleDays={tileStaleDays("<TYPE>")}` (weight, BP sys/dia, pulse,
+   body-fat, sleep, steps, VO2 max, 4× glucose contexts). Mood and the
+   BD-Zielbereich tile keep the default `null` because they have no
+   underlying per-type freshness signal (mood reads `/api/mood/analytics`;
+   BD-Ziel is an aggregate). The `tileStaleDays` helper returns the
+   `daysAgo` value only when it crosses the 7-day floor — the same gate
+   the `<TrendCard>` uses to decide whether to paint the caption.
+3. **`Cache-Control` on `/api/analytics`** — both slices stamp the typed
+   `NO_STORE_BUT_BFCACHE` constant (`private, max-age=0, must-revalidate`)
+   imported from IW-A's `src/lib/http/cache-headers.ts`. Replaces the
+   framework's stock `no-store, must-revalidate` which Chromium treats as
+   a hard bfcache breaker.
+4. **`<CoachLaunchProvider>` hoist** — moved from
+   `src/app/insights/layout.tsx` to `src/components/layout/auth-shell.tsx`
+   so the drawer is reachable from every authenticated route. The
+   `<LayoutCoachMount>` rides alongside the provider on the shell;
+   `<LayoutCoachFab>` stays scoped to `/insights/**` because the floating
+   action would distract from the dashboard hero.
+5. **Dashboard hero CTA** — new "Frag den Coach" / "Ask the coach" button
+   next to the existing "Hinzufügen" pill on `src/app/page.tsx`. Wires to
+   `coachLaunch.askCoach(null)`; mobile-first via `min-h-11` (WCAG 2.5.5)
+   with the matching `sm:min-h-9` desktop floor.
+
+## Locale changes
+
+Six locales (de, en, es, fr, it, pl) gained five additive keys each:
+
+- `dashboard.staleHintWeeksOne` / `staleHintWeeksOther`
+- `dashboard.staleHintMonthsOne` / `staleHintMonthsOther`
+- `dashboard.coachCta`
+
+`<TrendCard>` picks the right bucket based on `staleDays`:
+
+- `8 <= staleDays <= 30` → existing `dashboard.staleHint` ("X d ago")
+- `30 < staleDays <= 60` → `staleHintWeeks*` (singular at exactly 1 week)
+- `staleDays > 60` → `staleHintMonths*` (singular at exactly 1 month)
+
+Polish uses the genitive-plural form ("tygodni" / "miesięcy") that covers
+every non-1 count the bucket math can produce.
+
+## Files touched
+
+Source:
+- `src/app/api/analytics/route.ts`
+- `src/app/api/analytics/__tests__/route.test.ts`
+- `src/lib/analytics/summaries-slice.ts`
+- `src/lib/analytics/__tests__/summaries-slice.test.ts`
+- `src/lib/queries/use-analytics-query.ts`
+- `src/components/charts/trend-card.tsx`
+- `src/components/charts/__tests__/trend-card-stale-days.test.tsx` (new)
+- `src/app/page.tsx`
+- `src/components/layout/auth-shell.tsx`
+- `src/components/layout/__tests__/auth-shell-coach-hoist.test.ts` (new)
+- `src/app/insights/layout.tsx`
+- `src/app/__tests__/insights-polish.test.ts` (existing mount-location pin updated)
+
+Locales: `messages/{de,en,es,fr,it,pl}.json`.
+
+## Quality gates
+
+```
+$ npx tsc --noEmit
+ (clean)
+$ npx eslint <every touched file>
+ (clean)
+$ npx vitest run
+ Test Files  396 passed (396)
+      Tests  4205 passed | 1 skipped (4206)
+```
+
+Eight new test cases pin the contracts:
+- analytics route: `lastSeenByType` on both slices, bfcache header on both slices.
+- slim slice unit: `lastSeenByType` derived from the `DISTINCT ON` pass's `measured_at`.
+- trend-card: 6 cases covering the bucket-aware copy (silent, day-bucket, week-bucket, month-bucket, German singular/plural edge).
+- auth-shell hoist: provider import, drawer mount, no double-mount on insights layout.
+
+## Notes for downstream
+
+- The dashboard hero CTA hides cleanly when `featureFlags.coach === false`
+  OR the provider context is null. Operators that disable the Coach surface
+  app-wide see the existing "Hinzufügen" pill in the hero unchanged.
+- The slim slice's `lastSeenByType` is now consumed by `useAnalyticsQuery`
+  callers via the optional field on `AnalyticsRawPayload`; the dashboard
+  uses the thick slice today but the slim path is consumer-ready for the
+  sub-page surfaces that prefetch the lightweight payload.
+- Three commits were retag-rebased mid-session because parallel agents
+  share the working tree on `develop`. Final state on `origin/develop`
+  carries `9a8a9e9a`, `721e88df`, and `0729c202` with my full commit
+  messages intact.